BaTeMo2O9晶体单模切割方向的确定.PDF

BaTeMo O 晶体单模切割方向的确定 2 9 郭美玲 周国香 白雪 李佳 (河北工业大学理学院，天津300401) 摘 要： BaTeMo O 晶体是一种新型压电单晶, 目前未见关于其实际应用的报道。为了促进该晶体在压电换能器中的 2 9 应用，本文采用数值计算法研究了 BaTeMo O 晶体的单模切割方向。在实验数据的基础上，通过求解旋转坐标系下考虑压 2 9 电效应的Christoffel 方程，计算出了该晶体厚度振动模式下的单模，从而确定了晶体的单模切割方向。结果表明Y 切和X 切分别可获得纯纵模和纯切变模，且机电耦合系分别为0.6250 和0.2921 。(zyl)-θ切（θ可取任意值）也可获得纯切变模，且 在θ 为27.77o 时机电耦合系数高达0.9869 。同时也确定出了相应单模切型下的声波速度。 关键词：压电效应；BaTeMo O 晶体；厚度振动；单模切割方向 2 9 中图分类号：O738; O735 文献标识码：A Determination of the Cut Directions of Single Modes of BaTeM O Crystal O2 9 GUO Meiling ，ZHOU Guoxiang，BAI Xue, LI Jia (School of Science, Hebei University of Technology,Tianjin,China) Abstract: BaTeMo O is a new kind of piezoelectric single crystal. No literature has reported the practical application of it up 2 9 to now. In order to promote the application of it in piezoelectric transducer, the cut directions of single modes of BaTeMo O were 2 9 studied by numerical calculation. On the basis of the experimental data, single modes of thickness vibration were calculated by solving piezoelectric stiffened Christoffel equation in rotating coordinate systems. The cut directions of single modes were determined. The results indicate that a pure longitudinal mode and a pure shear mode can be obtained by Y-cut and X-cut with the correspondi